1 /*
   2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package jdk.jfr.event.oldobject;
  26 
  27 import java.io.IOException;
  28 import java.nio.file.Path;
  29 import java.nio.file.Paths;
  30 import java.util.ArrayList;
  31 import java.util.List;
  32 
  33 import jdk.jfr.Recording;
  34 import jdk.jfr.consumer.RecordedEvent;
  35 import jdk.jfr.consumer.RecordingFile;
  36 import jdk.jfr.internal.test.WhiteBox;
  37 import jdk.test.lib.jfr.EventNames;
  38 import jdk.test.lib.jfr.Events;
  39 
  40 /**
  41  * @test
  42  * @key jfr
  43  * @requires vm.hasJFR
  44  * @requires vm.gc == "null"
  45  * @library /test/lib /test/jdk
  46  * @modules jdk.jfr/jdk.jfr.internal.test
  47  * @run main/othervm -XX:TLABSize=2k -XX:-FastTLABRefill jdk.jfr.event.oldobject.TestLastKnownHeapUsage
  48  */
  49 public class TestLastKnownHeapUsage {
  50 
  51     public final static List<Object> heap = new ArrayList<>();
  52 
  53     public static void main(String[] args) throws Exception {
  54         WhiteBox.setWriteAllObjectSamples(true);
  55         long last = 0;
  56         for (int i = 1; i <= 5; i++) {
  57             long heapUsage = recordOldObjects(i);
  58             System.out.println("Recording: " + i + " heapUsage=" + heapUsage);
  59             if (heapUsage < last) {
  60                 throw new Exception("Unexpect decrease of heap usage");
  61             }
  62         }
  63     }
  64 
  65     private static long recordOldObjects(int index) throws IOException {
  66         try (Recording r = new Recording()) {
  67             r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");
  68             r.start();
  69             System.gc();
  70             for (int i = 0; i < 20; i++) {
  71                 heap.add(new byte[1_000_000]);
  72             }
  73             System.gc();
  74             r.stop();
  75             Path p = Paths.get("recording-" + index + ".jfr");
  76             r.dump(p);
  77             List<RecordedEvent> events = RecordingFile.readAllEvents(p);
  78             Events.hasEvents(events);
  79             long max = 0;
  80             for (RecordedEvent e : RecordingFile.readAllEvents(p)) {
  81                 long heapUsage = Events.assertField(e, "lastKnownHeapUsage").atLeast(0L).below(1_000_000_000L).getValue();
  82                 max = Math.max(max, heapUsage);
  83             }
  84             return max;
  85         }
  86     }
  87 }